Insulator.



Patenied July 8, I902.

J. E. CALVIN.

INSULATOR.

(Application filed May 1, 1002.)

(No Model.)

UNITED STATES PATENT OFFICE.

JAMES E. CALVIN, OF CAMPTONVILLE, CALIFORNIA, ASSIGNOR OF ONE- I'IALF TO ENOS C. COGHRAN, OF CAMPTONVILLE, CALIFORNIA.

INSULATOR.

dPECIFICATION forming part of Letters Patent N 0. 704,172, dated July 8, 1902.

Application filed May 1, 1902. Serial No. 105,461. (No model.)

To all whom, it may concern:

Be it known that I, JAMES E. CALVIN, a citizen of the United States, residing at Oamptonville, county of Yuba, State of California, have invented an Improvement in Insulators; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to improvements in insulators for electrical conductors, such as electric-light, telephone, and telegraph wires. Its object is to provide a simple device by which the conductor may be quickly engaged or released and without the use of the customary tie-wires.

It consists of abase having a longitudinallyslotted stem and a cap fitting said stem and adapted to securely look upon the conducting-wire.

It comprises details which will be more fully set forth hereinafter, having reference to the accompanying drawings, in which- Figure 1 is a view of the device with a wire engaged. Fig. 2 shows the base with cap removed.

A represents a base of any suitable design and made of any suitable insulating material, as glass, porcelain, gutta-percha, or the like. The bottom of the base has a threaded recess whereby it can be secured to a pole or crossbar in the usual manner. The base A is provided with a threaded stem or post 2, which is longitudinally slotted at 3 to receive the conductor-wire 4. A cap 5 screws on over the stem to securely clamp the wire in position. The annular shoulder 6, formed on the body A at the base of the stem, is provided with the shallow segmental grooves 7 in line with the slot 3, and the bottom of the latter is substantially flush with the bottom of said grooves. The edge of the cap 5, thatis adapted to rest on the shoulder 6, is provided with a series of corresponding radial grooves or cor= rugations 8, so that when the cap is screwed down tight onto the Wire it will firmly grip the wire in these corrugations and the cap will be prevented from unscrewing.

By this device a wire can be strung up in a very short time, the wire is maintained absolutely straight, and the inconvenience and expense incident to the use of tie-wires and the resulting interruption to the flow of the current are all avoided.

Having thus described my invention, what I claim, and desire to secure by Letters Patout, is--- 1. An insulator consisting of a base having a longitudinally-slotted screw-threaded stem or post and cap screwing on over said stem and having its under face radially recessed.

2. An insulator consisting of a base having a slotted screw-threaded stem, a screw-cap fitting said stem, said cap having radial corrugations on its edge in which the wire to be held is engaged.

3. An insulator consisting of a base, a cylindrical screw-threaded stem thereon, an annular shoulder on said base, said stem having a slot adapted to receive a conductor,said shoulder having grooves coincident with said slot so that the conductor is maintained and sup ported in an essentially straight line, and a screw-cap fitting over said stem and having corrugations on its edge in which the conduc tor is adapted to seat and prevent the cap from unscrewing.

h In witness whereof I have hereuntoset my and.

JAMES E. CALVIN.

Witnesses:

J. H. HORWEGE, A. M. LAcEY. 

